 <h2>边框圆角设置</h2>
  <p>使用rounded 类可以添加圆角边框:</p> 
  <span class="rounded"></span>
  <span class="rounded-top"></span>
  <span class="rounded-right"></span>
  <span class="rounded-bottom"></span>
  <span class="rounded-left"></span>
  <span class="rounded-circle"></span>
  <span class="rounded-0"></span>
</div>


#$
/*
//旋转木马-项目(轮播图片类,图片显示一行)
carousel-item
*/
    div class="carousel-item" >
    img src="/static/imgs/1.jpg" style="height:40vh;width:100vw">
  </div>  
    
    div class="carousel-item">
    img src="https://static.runoob.com/images/mix/img_nature_wide.jpg" style="height:40vh;width:100vw">
    </div>
#$


  



